Drill



July s, 1958 H. E. MILLER 2,842,015

DRILL Filed Nov. 12, 1954 2 Sheets-Sheet l Fig./

m m Inn I.

l" lllh A X Harry E. Mil/er -INVENTOR.

July 8, 1958 H. E. MILLER 2,842,015

DRILL Filed Nov. 12, 1954 2 Sheets-Sheet 2 Fig. 5

Harry E Miller INVENTOR.

BY %my zsyag DRILL Harry E. Miller, Gallitzin, Pa. Application November 12, 1954, Serial No. 468,339

2 Claims. (Cl. 77-65) This invention relates to a drill and more specifically provides improved and novel structural improvements in drills for drilling apertures into various types of material wherein the drills are free-running and accurate.

An object of this invention is to provide a drill having a shank together with cutting means at one end thereof and a pilot or guide drill of smaller dimensions than the cutting unit for boring a preliminary aperture and forming a pilot or guide for the cutting drill.

Another object of the present invention is to provide a drill having improved cutting means wherein the material will be cut and removed from the area of cutting thereby reducing the friction and heat caused thereby.

A further object of the present invention is to provide a drill having a tapered bore in the lower end thereof for receiving the tapered end of a guide drill or pilot Figure l is a side elevational view showing one form of the drill of the present invention;

Figure 2 is a bottom plan view of the construction of Figure 1 showing the details of construction of the exit grooves for the material being cut;

Figure 3 is a longitudinal, vertical sectional view taken substantially upon a plane passing through the longitudinal center line of the drill of Figure 1;

Figure 4 is a side elevational view of a modified form of the drill of the present invention;

Figure 5 is a side elevational view of another form rof the drill of the present invention;

Figure 6 is a longitudinal, vertical sectional view taken substantially upon a plane passing through the longitudinal center line of the construction of Figure 5 showing the details of construction thereof;

Figure 7 is a bottom plan view of the construction of Figure 5 showing the details and structural relationship of the cutting element;

Figure 8 is a bottom plan view of the construction of Figure 4 showing the relationship of the cutting elements thereof;

Figure 9 is a perspective view showing the tool for dislodging the pilot drill from the main drill.

Referring now specifically to Figures 1-3, it will be seen that the numeral 10 generally designates the form of the invention as illustrated in the figures. The drill 10 generally includes an elongated shank 12 that is tapered inwardly and upwardly for engagement in a chuck of a suitable drill press or hand drill. At the lower end of the shank 12 is a peripheral flange 14 having a plurality of tapered bores 16 therein for receiving a plurality of short tapered bits 13 having cutting ends 20 projecting below the lower surface of the peripheral flange M. in diametrically opposed peripheral surfaces of the peripheral flange 14 is a pair of vertical grooves 22 extending therethrough for permitting exit of the material being cut by the bits 20. The lower end of the shank 12 is also provided with an inwardly extending tapered bore 24 for receiving the tapered upper end 26 of a drill bit 28 which extends beyond the lower ends of the bits 20. The drill bit 28 is provided with spiral grooves 30 and a cutting end 32 wherein an aperture will be drilled by the bit 28 and the bits 263 will form a counter bore therein or drill a hole through the material as desired.

xtending inwardly and downwardly from one side of the shank 12 is a bore 34 communicating with the tapered bore 24 wherein a suitable tool may be utilized for engaging the upper end of the drill bit 23 for dislodgement of the tapered upper end 26 from the tapered bore 24 and the shank 12. If desired, a suitable set screw 36 may be utilized for securely locking the drill bit 28 within the tapered bore 24 thereby securing the drill bit 28 to the shank 12 for rotation therewith.

As illustrated in Figure 9, a tool 38 having a flattened and pointed end 49 is provided for insertion in the bore 3'4 for engagement with the upper end of the tapered portion 26 of the drill bit 23 so that the drill bit 2% may be expeditiously dislodged from the tapered bore 24.

Referring now specifically to Figures 4 and 8, it will be seen that the numeral 42 generally designates another form of the drill of the present invention. 42 includes a generally elongated shank 44 tapered for recession in a suitable chuck and at the lower end of the shank 44 is provided a peripheral flange generally indicated by the numeral 46 and including a plurality of downwardly and spirally extending teeth having rounded sharpened lower ends nil for engagement with material to be cut or drilled. Extending axially downwardly from the shank 44 is an intermediate member having cutters 54 thereon and extending axially downwardly therefrom is a drill bit 56 having a cutting end 58 for action as a pilot drill wherein the members 55 and 52 rotate with the shank 44 and co-act for facilitating the guiding of the movement of the drill 42. It will be noted that a suitable set screw 64) is provided for retaining the intermediate member 52 within an axial bore in the shank 44. Also, the bore 62 is provided for dis-- lodging the intermediate member 52 therefrom. Also, it will be understood that the drill bit 56 may be positioned within an axial bore and the intermediate member 52 in the same way as the intermediate member 52 is secured to the main shank 24.

Referring now specifically to Figures 57, it will be seen that the numeral 64 generally indicates another form of the drill of the present invention including a generally elongated shank 66 having a tapered portion 68 for engagement in a suitable chuck and including a plurality of longitudinally elongated flutes 'l'tl formed by a plurality of longitudinal grooves 72. The lower ends of the dates 7W3 are enlarged as indicated by the numeral 74 and are pointed and sharpened at the lower ends 76. A groove 75:? is provided in the peripheral surface of the shank 66 for removing and urging the material that has been bored upwardly to an out-of-the-way position. The lower end of the shank 66 is provided with an axial bore The drill -fi 80 having a tapered upper end portion in communication with an inwardly and downwardly extending bore 82 providing access to the upper end of an intermediate member that is provided with a tapered upper end portion for engagement in the bore 84). A suitable set screw may be provided for securely locking the intermediate member 534 within the bore 86. In the lower end or": the intermediate member 84 is a tapered bore 99 having tapered upper end 92 of a drill bit 94 therein wherein a suitable set screw 96 may be provided for locking the device therein and also, it will be under stood that a suitable bore may be provided for engaging the upper end of the drill bit 94- for dislodging the drill bit 94 from the intermediate member 84. The intermediate meniber at the lower end thereof is provided with a peripheral flange designated by the numeral 98 and including a plurality of cutting edges 1%. Also, the drill bit 94 is provided with a spiral groove 102 and a sharpened cutting end 104 wherein the drill bit 94 together with the intermediate member 84 and the cutting element thereon will form a pilot for cutting material such as wood or the like.

In operation, the device in Figures 5-7 as well as the device in Figure 4, will be utilized in drilling apertures through wood regardless of the condition thereof and the particular .tngement of the pilot drill in conjunction with the main cutting member will greatly facilitate the accuracy of the drilling operation and reduce the wear on the bit and the heating up of the bit caused by aimthe condition of the wood. The drill bits as illustrated L have been extensively used in drilling holes through various types of wood having various knotty conditions with a n'tiniinum of wear, heating up, breakage and time expendage. The device of Figures l3 is normally utilized for boring apertures in metallic materials and it 4 and accordingly, all suitable modifications and equivalents ay e esort to, falling th t cope f he appended claims.

What is claimed as new is as follows:

1. A compound drill device comprising an elongated shank adapted to be secured to the rotating spindle of a drill, said shank having an inwardly extending tapered socket in one end thereof, a peripheral flange on said shank at said one end, a plurality of longitudinally distapered bores extending through said flange, a tapered bit disposed in each of said tapered bores for forming a cutting device, said flange having circumferentially spaced grooves in the periphery thereof for permitting passage of cut material, an elongated bit having t :crcd upper end disposed in said tapered socket, said elongated bit extending axially beyond the tapered bits for forming an auxiliary cutting means said elongated bit extending to the lower end of the flange with the upper end disposed above the flange, and a setscrew for locking the upper end in the socket.

2. The combination of claim 1 wherein said shank is provided with an upwardly inclined aperture communi eating with the upper end of said socket for providing access to the upper end of said elongated bit, said tapered bores in the flange being disposed outwardly of the shank with the small ends of the tapered bits being disposed above the flange for permitting removal thereof, said grooves being generally V-shaped and in spaced relation to the tapered bores.

References Cited in the file of this patent UNITED STATES PATENTS 162,315 Shaw et a1. Apr. 20, 1875 267,590 Revenaugh Nov. 14, 1882 298,248 Smart May 6, 1884 303,053 Russel Aug. 5, 1884 835,l25 Webl Nov. 6. 1906 1,164,659 Moore Dec. 21, 1915 1,226,386 Sackett May 15, 1917 1,398,779 Hayden Nov. 29, 1921 1,474,049 McCurdy Nov. 13, 1923 1,499,584 Litchfield July 1, 1924 1,566,373 Carter Dec. 22, 1925 2,367,221 Kraus Jan. 16, 1945 2,468,562 Lank Apr. 26, 1949 2,643,692 OBrien June 30, 1953 

